Abstract：A dynamic simulation model of novel leg type lander is established. Based on the simulation model, the soft landing performance of the lander under the uncertain landing environment is analyzed by using Monte Carlo method. In order to improve the soft landing performance of the lander, the influence of configuration parameters of landing gear on soft landing performance is analyzed, and the response surface models which reflects the complex relationship between the configuration parameters of landing gear, the landing environment parameters and the values reflecting the soft landing performance are established. Then the configuration of landing gear is optimized based on the response surface models and Monte Carlo method. Optimized configuration of landing gear enhances the ability of the lander to resist being overturned with the consideration of the uncertain landing environment. Also the possibilities the minimum distance between the center of bottom surface of the nozzle and the surface of the planet and the buffer stroke of assistant pillar exceeding the allowable values are equal to 0.
